John wrote: "Sodium carbonate is an alkali. (The Merck index
gives 11.6 as the pH of an aqueous solution of
unspecified strength.)"

Interestingly, a 1M solution of this gave me a pH of 11.0.  Increasing
the concentration brought the pH down.  0.1M gave me a pH of 11.2, 0.05M
held steady at pH 11.2.  That was the extent of my testing as 11.2 was
an acceptable number to the researcher.

Thanks for your help, John!

Teri

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